Re: random access iterator

=?Utf-8?B?R2Vvcmdl?= <>
Sun, 2 Mar 2008 02:00:00 -0800
Thanks Abhishek,

Question answered. Cool!


"Abhishek Padmanabh" wrote:

"George" <> wrote in message

For random access iterator, operator[] is supported. Mentioned in Bjarne's
book, Chapter 19 (Iterators and Allocators).

I have not used operator[] on random access iterator before and I have not
found a good and simple sample either. :-)

That is because it is not very intuitive to use as compared to using the
operator[] overloaded for the container itself. Also, as far as VC++ 2005 is
concerned, it causes two dereferences. You can use the iterator's operator[]
as below:

using std::vector;
int main()
  vector<int> vec(10);
  vector<int>::iterator it = vec.begin();
  int fifth_element = it[4]; //equivalent to advance it by 4 and
dererefence the resulting iterator
  int fifth_element = vec[4]; //preferred and more intuitive

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